#BMI&BMR
def main():
    y_or_n = input('是否退出程序(y/n)?')
    while y_or_n !='y':
        # 性别
        gender = input('性别：')
        print(type(gender))
        #体重（kg)
        weight = float(input('体重(kg):'))
        #身高(cm)
        height = float(input('身高(cm):'))
        #年龄
        age = int(input('年龄：'))
        if gender == '男':
            #男性
            bmr=(13.7 * weight) + (5.0 * height)-(6.8 * age)+66
        elif gender == '女':
            #女性
            bmr = (9.6*weight) + (1.8 * height) - (4.7*age)+655
        else:
            bmr=-1
        if bmr != -1:
            print('基础代谢率(大卡):',bmr)
        else:
            print('暂不支持该性别')

        print() #输出空行
        y_or_n = input('是否退出程序(y/n)?')
